loving Tips : This device only support 2.4 G WIFI router and 2/3/4G seaborne network, it can not 5G router. Please do not the maximum load current of 10ASonoff switch only use `` eWeLink '' freeborn app, others can not support.Production Description : Power supply : 90-250V AC Security Mechanism : WEP/WPA-PSK/WPA2-PSK Operating Temp : -20 degree ~ 70degree Material : RF-ABS Connector : Universal Functions : far ON/OFF : Turn electric devices on/off from anywhere App Support : Free IOS and automaton seaborne App eWelink Sync Status : echt time device status provided to App Timing : Set scheduled/countdown timers to turn on/off at specific time Share Control : Control your overbold home together with your family Scene : Turn on/off a gang of devices one tap overbold Scene : Trigger on/off by temperature, humidity or remaining biological science conditions Network Support : Control electric devices over Wi-Fi or 2/3/4G seaborne network Voice Control : Works perfectly with Amazon Alexa How to install this device, please do as follow : 1. off electricity source 2. the covers at both ends 3. the two electricity source cables -LRB- Live and Neutral -RRB- to the ports with `` IN '' mark, one cable for one port, and there 's no limitation for which port to connect 4. the two appliances cables -LRB- Live and Neutral -RRB- to the two ports with `` OUT '' mark, one cable for one port, and there 's no limitation for which port to connect make the cover install firmly Welcome to visit the below link get more details of how to use it, please find `` SONOFF -LRB- RF -RRB- USER GUIDE '' : http://ewelink.coolkit.cc/?p=126 Package Included Sonoff x 2 Screw x 8 .